map, filter を object にも使う方法【fp-ts の紹介】 - Qiita

import { pipe } from "fp-ts/function" import { array as A, record as R } from "fp-ts" // utils const isEven = (n: number) => n % 2 === 0 const double = (n: number) => n * 2 // data let data1 = [1, 2, 3, 4, 5, 6] let data2 = { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 } // data1. filter(isEven). map(double) // ES6 const result1 = pipe(data1, A.filter(isEven), A.map(double)) // fp-ts Array const result2 =